Communications: electrical – Continuously variable indicating – With meter reading
Patent
1986-06-20
1988-07-26
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
178 3, 370 60, H04Q 900, H04L 1100
Patent
active
047603950
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement permitting communication between pieces of equipment in a communications network, for example an integrated network for data, telephony, text and/or images. The aforementioned communications network is also of the kind which, in principle, provides the integration of at least two networks with different network architectures. The aforementioned communications network is constructed with its own specific network architecture independent of the architectures of the aforementioned two networks. There are connected to a selector system of the communications network pieces of conversion equipment through which connections between pieces of equipment for different network architectures are capable of being linked.
DESCRIPTION OF THE PRIOR ART
The different companies which market different pieces of equipment on the open market, for example computers and terminals, etc., and their associated communications systems, stipulate the use of designs specific to that particular company, which means that the system of one company will not, as a general rule, be compatible with the system of another company. The following may be mentioned as examples of previously disclosed systems: SNA (System Network Architecture), DCNA (Distributed Communication Network Architecture), and DECNET (Digital Equipment Computer Network).
DESCRIPTION OF THE PRESENT INVENTION
Technical Problem
There is a general wish for the expansion of data communications networks of the type in question, to which connection is possible and in which communication can be provided between the pieces of equipment which are specific to the different companies. This presupposes, amongst other things, the use of conversion equipment, and it is desirable in this respect that the designs of the components concerned should be simple, and that the range of components should be kept to a minimum.
Solution
One of the objects of the present invention is to solve the problem outlined above, and what may be regarded in this respect as being essentially characteristic of the novel arrangement is that connections between pieces of equipment belonging to the specific architecture, that is to say the architecture of the communications network, and a second network architecture are routed via a piece of conversion equipment, and the connections between pieces of equipment belonging to two other network architectures are routed via two pieces of conversion equipment wired in series.
In further developments of the idea of invention it is proposed that the first pieces of conversion equipment should be so arranged as to be utilized for the conversion of link protocol between equipment in the specific network architecture (i.e. that of the communications network) and equipment in each of the aforementioned other network architectures, and that the other pieces of conversion equipment should be so arranged as to be wired in series with the aforementioned first pieces of conversion equipment for the purpose of the convention of link protocol between equipment belonging to two of the aforementioned other network architectures.
Advantages
The solution proposed above will permit the number of pieces of conversion equipment to be kept to a minimum, at the same time as a comparatively simple design can be retained for each of the pieces of conversion equipment.
DESCRIPTION OF THE DRAWINGS
A preferred embodiment of an arrangement which exhibits the significant characteristic features of the invention is described below with reference to the accompanying drawing.
FIG. 1 shows in the form of a block diagram the basic design of a communications network having, amongst other things, terminals, processors and path selection equipment; and
FIG. 2 shows in the form of a block diagram the basic design of the central monitoring organs in the network in accordance with FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A communications network, for instance an integrated network for data, telephony, text and/or images, is indicated b
REFERENCES:
patent: 4323728 (1982-04-01), Bergman et al.
patent: 4466063 (1984-08-01), Segarra et al.
patent: 4525830 (1985-06-01), Cohen et al.
patent: 4597074 (1986-06-01), Demichelis et al.
Paul Guinaudeau, The International Packet Switching Services in France, IEEE Conference: 1981 International Conference on Communications, Denver, Colo., USA (Jun. 14-18, 1981), S1792-0113.
EP 0125773-A2, J. P. DeVita, et al, Nov. 21, 1984.
Akesson Bengt
Katzeff Kurt
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